VELOCITY REQUIREMENTS FOR A SOFT LANDING ON PHOBOS OR DEIMOS IN 1969
AEROSPACE CORP EL SEGUNDO CA TECHNOLOGY OPERATIONS
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The velocity requirements to soft land on either Phobos or Deimos, the small Martian moons, are determined for the 1969 launch opportunity. A single impulse retro and plane change maneuver is applied at periapsis of the hyperbolic trajectory to achieve the desired final orbit about Mars. Less Delta-V is required to attain the orbit of Phobos. This fact, combined with the lower orbital altitude, makes Phobos the preferred target for a soft landing. The minimum Delta-V for a soft landing does not coincide with the minimum injection energy for a ballistic trajectory to Mars, so that a trajectory can be found that maximizes the payload landed on Phobos.
- Spacecraft Trajectories and Reentry